190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 21-30
21.3.7 TIT (Turbine Inlet Temperature) Sensor
The G3X system supports Type K grounded thermocouples for sensing turbine inlet temperature (TIT),
turbine outlet temperature (TOT), or inter-turbine temperature (ITT). This type of sensor is applicable to
all turbocharged or turbine engines.
To maintain measurement accuracy, appropriate thermocouple extension wire must be used to connect the
TIT probe sensor wires directly to the inputs of the GEA 24/GSU 73. To minimize risk of breakage, it is
recommended that a high-quality stranded (as opposed to solid) thermocouple wire be used. For Type K
thermocouples, one such example of appropriate wire is TT-K-22S Type K thermocouple wire from Omega
Engineering. When attaching thermocouple extension wire with splices or connectors, the connections for
an individual pair of positive/negative wires should be located close together to make sure they are exposed
to similar ambient temperatures.
NOTE
If ungrounded thermocouples are used, the low side must be connected to a GEA 24/
GSU 73 ground pin.
21.3.8 Bus Voltage Monitor
Bus voltage is normally sensed from an external voltage signal connected to a GEA 24/GSU 73 analog
input (refer to Section 26
for interface drawings). Optionally, the GEA 24/GSU 73 can be configured to
measure bus voltage without requiring an external connection, by sensing the voltage of its power supply
inputs. See Voltage portion of Appendix H.4.19.3.2
for GDU 37X systems and Section 30.4.32.14 for
GDU 4XX systems (Volts 1 and Volts 2 Inputs) for configuration guidance.
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